The Analysis Of Seismic Performance Of Precast Concrete Frame Structure

Precast prestressed fabricated concrete structure is a new type of prefabricated structure,it aims to solve the problem of shortage of precast structure aseismatic capability.Its connection uses the Prestressing tendons as a means of assembly,which is regarded as a "flexible connection".Prestressing tendons cooperate with dampers can ensure the structure have enough seismic ability.This paper mainly researches on the seismic performance of precast structure,and give advice according to the results of the study.The analysis of seismic performance of prestressed precast concrete frame structure mainly adopts the method of numerical analysis,using the finite element analysis software ANSYS.In terms of finite element modeling,combining with the basic theory of finite element knowledge,the selection of element,connection processing,meshing and so on has carried on the detailed discussion.The analysis of seismic performance of prestressed precast concrete frame structure,using three-stroy double-span prestressed precast concrete frame and common structure size three-stroy double-span cast-in-place frame,from two aspects of static analysis and dynamic analysis.Static analysis is aimed to analyze the different influence of axial compression ratio,lateral stiffness and ultimate lateral.When the axial compression ratio is the same,the displacement of the precast concrete frame relatively large,relatively obvious stress concentration phenomenon,suggested the limit value of column axial compression ratio for prestressed precast concrete frame structure appropriate decrease on the basis of the limit value of axial compression ratio for cast-in-site frame structure.In addition,the same condition,the results prove that the prestressed precast frame have smaller lateral stiffness,bigger ultimate lateral.The main method of the dynamic analysis are respectively to conduct nonlinear time history analysis for the seismic performance of prestressed precast concrete frame structure and cast-in-place concrete frame under the three kinds of 7 degrees 0.1g rarely met earthquake using ANSYS software.Results prove that the top floor displacement and acceleration of the two kinds of structure slightly different under the under the action of seismic wave,lateral displacement curve and the story drift tend to be more consistent,proving that the precast frame structure has the same seismic capacity with cast-in-site frame structure.